William d



UN TED STATES PATENT. .OFFICE.

WILLIAM D. ADAMS, or BROOKLYN, NEW YORK, ASSIGNOB TO HENRY voe'r, or SAME PLACE.

a I STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 293,697, dated February 19, 1884.

Application filed June 29, 1883. (No model.)

To all whom it may concern.-

of twocylindric sections of different diameter and a crescent-shaped plate uniting the said sections, the smaller section being'arranged forward of the larger section, and the upper sides'of the two. sections being in line, of long tubes extending through both said sections, shorter tubes extending from the crescent-shaped plate rearward through the larger section, a furnace below the smaller section and forward of the larger section, and a bridge-wall at the front end ofsaid larger section, extending upward to the under side thereof, whereby the'heated products of combustion are caused to pass directly from the furnace through said shorter'tubes, as more particularly hereinafter described.

In the accompanying drawings, Figure l is a longitudinal section through the center of the boiler fire-chamber and brick-work set ting. Fig. 2 is a vertical transverse section through .70 m of the same, and Fig. 3 is a'vertical transverse section through the shell of the boiler on the line 00 0:.

Similar letters of reference designate corresponding parts in the several figures.

A 13 indicate the shell of a boiler constructed upon my improved plan, composed of the two cylindrical sections Aand B, of different diameter, arranged opposite but eccentric to each other, the front section, A, of the smaller diameter, being arranged so that its upper part is on line with the upper part of the rear section, B, of larger diameter. The two sections are open to each other, and are united together by the ores-- cent-shaped plate or tube-sheet O, which closes that part of the section B below and at the sides of the section A. The front and rear ends or heads of the shell are formed by tube-sheets D and D. E represents the furnace'or fire-chamber, provided with the usual grate-bars, F, and bridge-wall G, the said wall being flush or near the plate 0, and the fire-chamber being under the front smaller section of the wall and forward of the plate 0.

vided with the usual ash-pit door, M, furnacedoor N, and the door P, which may be opened for cleaning the boiler-tubes a a and b b.

Q represents bearers secured to the boiler, for supporting the latter on the side walls.

The bridge-wall G extends upward to the under side. of the larger shell-section B, and hence all the products of combustion are caused to pass from the furnace directly through the tubes 1).

' In operation, the flame and heated gases will first act on the exposed parts of the crescent-shaped plate 0 and the cylindrical section A, which is raised sufficiently high above the grate-bars to allow a proper combustion of the fuel, thence directly through the series of tubes 1) b to the rear uptake, K, returning through the tubes at a to the upper flue leading to the stack.

WVhat I claim as my invention, and desire to secure by Letters Patent, is

The combination, with a boiler the shell of which is composed of the two cylindric the purpose herein described.

' WILLIAM D. ADAMS.

Witnesses:

FREDK. HAYNES, ED. L. MORAN. 

